Process for controlling the cooling air mass flow of a gas turbine set

Abstract

The invention gives a process for the control of the amount of cooling air of a gas turbine set (1, 2, 3). Suitable means (32, 33) are provided in the cooling system (26, 27) to enable the amount of cooling air to be varied. The control of this means takes place in dependence on an operating parameter (X). This is determined in a computer unit (22) by suitable combination of measured machine data (p1, p2).

Description

The invention relates to a process according to the preamble of claim 1.STATE OF THE ARTIntermediate cooling in the compressor of a gas turbine set is a well-known measure which can substantially contribute to an increase of the efficiency factor and the performance of a gas turbine set, particularly when the heat removed from the partially compressed working medium can be usefully employed at a place in the power station. EP 515 995 proposes in this regard to conduct the compressor air through a steam generator, and thus to produce an amount of steam which can be further used in the water-steam circuit of a combination plant. EP 781 909 and EP 898 645 propose supersaturating the air with water at the compressor inlet, so that a binary air-water-steam mixture enters the compressor. The successive evaporation of the water droplets introduced into the compressor leads to an intensive internal cooling of the compressor; the resulting steam is expanded in the turbine of the gas turbine ...

AI Technical Summary

Problems solved by technology

With regard to the first proposed variant, it is to be stated in this connection that this leads, in operation without compressor cooling, to a cooling air mass flow which is far above what is required, markedly limiting the power and efficiency factor potentials of the gas turbine set.

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